Then in that case it is subjective to whatever YOUR desires are… and I cannot help you by telling you what those are:-). Though at a guess, you sound like you would be more permissive towards it - like especially if you got a refund when you asked for one then all is good for you.

But there is an argument to be made that a company that is this negligent in checking whether the sample was contaminated in any way before sending out the results is arguably not one that you want to use? Even if it was the only company in existence that offered that service - at what point is bad information, i.e. unreliable & untrustworthy, worse than no information at all?

Though again, that gets back to it being a subjective determination. Which if not pertaining directly to you, needs to be applied to the customer population at large. Likely many of them would want some measure of reliability in the results, which is a pressure towards them “having to”, in order to stay in business - i.e. even if you would offer them your own business, they need a sufficient amount overall to remain viable.

Ofc, you cannot truly know the answers to your questions, without deeper testing. I am just saying that based on the evidence put forth so far, it is not looking good. Especially if the industry overall is entirely unregulated. You could send them the same sample three times and get back a different dog each time? Or not… but then depending on the breed, some are more trustworthy than others? Or they could detect a lot of business from one customer, and start doing higher QA checks on only those samples, at the expense of all the others.

The true answer is that none of this is really known, and they can do whatever they can get away with - at which point the fact that they have already been caught, when such a simple & basic test could have easily prevented it, does not bode well for the other issues that remain unknown. The prior has shifted.